Vehicle-mounted communication system wireless resource scheduling method

Abstract

The invention provides a vehicle-mounted communication system wireless resource scheduling method, and aims at providing the scheduling method which allows the overall performance of a vehicle-mounted communication system to be improved, allows the fairness of users to be guaranteed and allows the requirements of the users for different services to be met so that the fairness of communication between OBUs at different speeds and an RSU in the vehicle-mounted communication system can be better improved and the time delay requirements of various vehicle-mounted communication services can be met. The method includes the steps that the RSU judges state information of a vehicle, obtains location formation and movement information of the vehicle in the activated state and obtains a speed priority factor of the OBUs, service priority factors of the OBUs are obtained according to the requirements for the service types and the service quality of the OBUs, the channel quality between each OBU and the RSU is obtained according to the location information of the vehicle, the real-time transmission rates of the OBUs are calculated, fairness priority factors are obtained through calculation of the real-time transmission rates of the OBUs, the user priorities of the OBUs are obtained through a scheduling algorithm according to the speed priority factors, the service priority factors and the fairness priority factors, data are transmitted and the average transmission rate is updated and recorded according to the priority sequence, vehicle information and channel information are updated, and the scheduling process is not stopped until the circulation stops.

Description

technical field [0001] The invention relates to a wireless resource scheduling method applied to a vehicle-mounted communication system. The purpose is to introduce the time-varying characteristics of the channel and the motion characteristics of the vehicle and distinguish the service quality requirements of different services, thereby improving the overall throughput of the system and ensuring fairness ; Suitable for vehicle communication system. Background technique [0002] The traditional packet scheduling is suitable for packet data services, according to the random distribution characteristics of packet arrival time interval and packet length, so as to manage and schedule packet data user services, and the scheduling algorithm determines the order and availability of packet transmission. The bit rate used. At the same time, because of the ever-changing fading conditions of the wireless channel, it is necessary to consider the time-varying characteristics of the wirel...

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Problems solved by technology

[0004] However, for the fading of the ever-changing vehicle communication wireless channel, the instant-changing wireless channel is still based on the traditional 802.11 scheduling method, which does not fully consider the specific conditions of the channel, resulting in the weakening of the overall system performance, and for vehicles with different operating speeds The fairness factor between vehicles has not been fully considered. Factors such as the relative position and running speed of vehicles need to be considered, and only by setting different minimum and maximum competition window lengths to distinguish service levels. Such a setting cannot ideally guarantee service service quality requirements

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